You are launching a tape channel, and then trying to delete archive log files. That cannot work: it is impossible for archive log files to exist on a tape device. Archive logs will always be on disc, it is only backup sets that can go to tape.

This looks better.
Your archive logfiles exist only on disk, so to delete them launch a disk channel.
To delete the backup sets on tape that contain the archive logfiles, something like the above command should do.